There is no minimum memory requirement when using OnClick Utilities. OnClick Utilities requires Windows 2000 or newer and can be used with 64-bit versions of Windows.
Special considerations apply to the following programs:

FindOnClickYou will need enough free disk space to view and search for files.Because of its low-level access to your drives, it is advisable that you have Administrator privileges in Windows to install and use FindOnClick. If you run FindOnClick without Administrator privileges, then it will fall-back to using the standard Windows method of searching for files, which will result in a much slower search.

EncryptOnClickYou must have enough free disk space to encrypt and decrypt files.

UndeleteOnClick
Administrator rights are required to undelete files.If attempting to undelete a file or files it is very important that you do not write to disk. If you want to recover files now read Using UndeleteOnClick before continuing.

The SyncBack family of products backup, synchronize, and restore data files.

SyncBackPro, SyncBackSE, SyncBackLite and SyncBackFree work on Windows (10, 8, 7, Vista - 32/64-bit), and are used by individuals, small businesses, and organizations throughout the world. All four programs can be installed at the same time so you can evaluate which works best for you.

SyncBackPro and SyncBackSE also allow you to backup your data across multiple operating systems using SyncBack Touch which works with Windows, macOS (Apple), and Android (Mobile phones and Devices).